Final answer:
The sentence 'The sun walked down the valley as the day wore on' is the best example of personification.
Step-by-step explanation:
The best example of personification is the sentence: The sun walked down the valley as the day wore on. Personification is a figure of speech in which non-human objects or abstract ideas are given human-like qualities. In this sentence, the sun is given the human-like action of walking, which is a clear example of personification.
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